The Right to equal protection of the law is explained in these documents:

Legally Obligating Documents
African (Banjul) Charter on Human and People's Rights  (3)
American Convention on Human Rights  (24)
Convention on Elimination of All Forms of Discrimination Against Women  (2)
International Convention on Elimination of All Forms of Racial Discrimination  (5(a))
International Covenant on Civil and Political Rights  (26)

Standard Setting Documents
Beijing Platform for Action  (232(d))
Universal Declaration of Human Rights  (7)